Remember the student in school who complained (or even cried) because they only got a ninety-nine percent mark on an assignment or test. Meanwhile, some of us were relieved (if not ecstatic) to have merely passed.
I actually witnessed one case where the math student insisted that he was not wrong. On rechecking the test, the teacher realized the answer sheet was wrong and not the student. The student got one hundred percent correct.
Realistically, however, most of us lesser mortals can’t expect to get a perfect mark or score every time.
First of all, none of us are perfect. We all make mistakes.
Secondly, unlike math, some subjects are more subjective in nature. In certain subjects, the answer to a question may not be simply right or wrong. The teacher may have more latitude in how your grades are calculated. The teacher may even (consciously or subconsciously) increase or decrease your grade based on whether they like you (or your attitude) or not.
Similarly, in business, you can’t please everybody all of the time.
In eBay or other Internet auctions, you will not be able to satisfy everyone. Even if you have one hundred...